"getnameinfo" is new with Windows XP - it is not supported (as far as I can tell) on older platforms (such as Windows 2000 or Windows 9x).
MSDN lists this function as being defined in the ws2tcpip.h file - as far as I know, this is only available in the January 2003 or later version of the Platform SDK. Because this function is only supported for Windows XP, it is not something that can be targeted in a package such as XMail, due to the wide level of support required. Also, it is a very good example of Microsoft breaking things for their own purposes - gethostbyaddr has been around since (IIRC) the original Berkeley Sockets implementation. Just because Microsoft decided to add "special" functionality to it for Windows (ie. NetBIOS name resolution) doesn't mean that it was right for this to be done - all it does is force programmers to break code compatibility across OS platforms by requiring a Windows specific call (getnameinfo) to avoid NetBIOS resolution. I suspect you'll continue to see gethostbyaddr used in Windows code for a long time to come. BTW, because of the insecure nature of NetBIOS, many companies block NetBIOS at their firewalls. You may want to consider this on your network, as well - there are many Windows exploits that use NetBIOS.... At 09:42 9/26/2003, jhon wong wrote: >Hi Tracy, > > You are right. I trid the nbtstat -A 218.246.127.68, >it really return NETBIOS name. > > Yes,in windows platform,"gethostbyaddr" is adapted to >NETBIOS. And microsoft advise to use "getnameinfo" >instead of "gethostbyaddr". please see: > >http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/win >sock/gethostbyaddr_2.asp > > But I can't find "getnameinfo" in <winsock2.h> at all >with vc6.0.I don't know why. > > Best regards, > Jhon > > >----- Original Message ----- >From: "Tracy" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Friday, September 26, 2003 9:07 PM >Subject: [xmail] Re: question about RDNS > > > > You're running Windows, yes? If so, this is "by design". If Windows is not > > able to resolve an address by finding a PTR record, it attempts to resolve > > the address using NetBIOS - to do this, it issues a NetBIOS request to the > > machine in question and listens for a response. Assuming no firewalls get > > in the way, the machine will answer that request with it's "computer name" > > (the locally assigned name that was created during the installation of > > Windows). > > > > Try using: > > > > nbtstat -A 211.149.111.76 > > > > and see what comes back (note that the -A must be a capital A, not a lower > > case a). I'm guessing that the name you are seeing in your mail logs will > > show up in the output from that command. (I'd try it here, to give you > > sample output, but I have NetBIOS blocked at my border router.) > > > > At 09:13 9/26/2003, jhon wong wrote: > > > > > > >Hi,Jeff: > > > > > > According to my knowledge, when gethostbyname > > >execute RDNS result,it should return FQDN result > > >if ip has PTR. > > > But I find that sometimes non FQDN result > > >is returned and in fact the ip hasn't PTR at all. > > >That is the problem. > > > > > > > > > > > > > > > > > > Hi Davide, > > > > > > > > Could his problem have anything to do with Verisign's new policy of > > > > redirecting lookups for bogus domains to one of their sites? > > > > > > > > Jeff > > > > > > > > > > > > - > > > > To unsubscribe from this list: send the line "unsubscribe xmail" in > > > > the body of a message to [EMAIL PROTECTED] > > > > For general help: send the line "help" in the body of a message to > > > > [EMAIL PROTECTED] > > > > > > > > > > > > > > > > >- > > >To unsubscribe from this list: send the line "unsubscribe xmail" in > > >the body of a message to [EMAIL PROTECTED] > > >For general help: send the line "help" in the body of a message to > > >[EMAIL PROTECTED] > > > > > > - > > To unsubscribe from this list: send the line "unsubscribe xmail" in > > the body of a message to [EMAIL PROTECTED] > > For general help: send the line "help" in the body of a message to > > [EMAIL PROTECTED] > > > > > > >- >To unsubscribe from this list: send the line "unsubscribe xmail" in >the body of a message to [EMAIL PROTECTED] >For general help: send the line "help" in the body of a message to >[EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
